| 氢气还原法制备LiFePO_4及其电化学性能的研究 |
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| 引用本文： | 张兵兵,杨长春,杜红军,徐松,伍伟峰,石永伉. 氢气还原法制备LiFePO_4及其电化学性能的研究[J]. 材料导报, 2009, 23(24) |
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| 作者姓名： | 张兵兵 杨长春 杜红军 徐松 伍伟峰 石永伉 |
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| 作者单位： | 1. 郑州大学化学系,郑州,450001
2. 中平能化尼龙化工有限责任公司,平顶山,467000 |
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| 基金项目： | 国家自然科学基金资助项目，郑州市科技攻关项目 |
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| 摘 要： | 在溶液中制备FePO_4·2H_2O前驱体,利用氢气还原法于650℃制得了锂离子电池正极材料LiFePO_4,并对其进行了包覆和掺杂.采用X射线衍射法(XRD)、扫描电镜法(SEM)、循环伏安法(C-V)、交流阻抗法(EIS)及充放电测试对材料进行了结构表征和电化学性能测试.结果表明,该方法制得的材料具有单一的橄榄石结构,样品形貌规则、颗粒均匀.包覆碳和掺镁后,材料具有较低的阻抗及较高的首次放电比容量,LiFePO_4、LiFePO_4/C、LiMg_(0.01)Fe_(0.99)PO_4/C的首次放电比容量分别为125.09mA·h/g、139.17mA·h/g、146.97mA·h/g.
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| 关 键 词： | 锂离子电池 正极材料 氢气还原法 |
Synthesis and Characteristics of LiFePO_4 Materials Prepared by Hydrogenous Reduction |
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| ZHANG Bingbing,YANG Changchun,DU Hongjun,XU Song,WU Weifeng,SHI Yongkang. Synthesis and Characteristics of LiFePO_4 Materials Prepared by Hydrogenous Reduction[J]. Materials Review, 2009, 23(24) |
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| Authors: | ZHANG Bingbing YANG Changchun DU Hongjun XU Song WU Weifeng SHI Yongkang |
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| Abstract: | LiFePO_4 materials are prepared by hydrogenous reduction(a method of preparing LiFePO_4 material with prue H_2 gas as protective and reducing gas)with FePO_4·2H_2O. The.samples are characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM),cycle voltammetry(C-V)and electrochemical performance testing.The results show that materials with a single olivine structure,rules of the sample morphology and particle uniformity.It has a lower post-impedance,and higher initial discharge capacity after coated with carbon and magnesium-doped(LiFePO_4 125.09mA·h/g,LiFePO4/C 139.17mA·h/g and LiMg_(0.01)Fe_(0.99)PO_4/C 146.97mA·h/g). |
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| Keywords: | LiFePO_4 lithium ion battery cathode material LiFePO_4 hydrogenous reduction |
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